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Equity Incentive Plan - Summary of Stock Based Compensation Expense Regarding its Employees and Nonemployees (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Research and Development Expense	$ 25,644	$ 39,272	$ 59,599	$ 80,737
General and Administrative Expense	9,293	6,626	28,149	16,441
AnaptysBio' s 2017 Plan
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	1,472	15,402	12,975	7,656
First Tracks Equity Plan
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	6,847
Location, Statement of Income, Balance [Axis]: us-gaap:GeneralAndAdministrativeExpense \| AnaptysBio' s 2017 Plan
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	738	6,344	7,695	3,036
Location, Statement of Income, Balance [Axis]: us-gaap:GeneralAndAdministrativeExpense \| First Tracks Equity Plan
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	3,251
Location, Statement of Income, Balance [Axis]: us-gaap:ResearchAndDevelopmentExpense \| AnaptysBio' s 2017 Plan
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	734	$ 9,058	$ 5,280	$ 4,620
Location, Statement of Income, Balance [Axis]: us-gaap:ResearchAndDevelopmentExpense \| First Tracks Equity Plan
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	$ 3,596